Charge distribution studies in the epi-cadmium neutron induced fission of 235U

초록

For the first time, charge distribution studies have been carried out in the epi-cadmium neutron induced fission of 235 U by measuring the fractional cumulative yields (FCY) and independent yields (IY) of various fission products. An off-line gamma-ray spectrometric technique was used for the measurements. The average energy of the epi-cadmium neutron spectrum is 1.9 MeV. From the FCY values, the isobaric width parameter ( sigma Z ), most probable charge ( Z P ) and the charge polarization ( Delta Zeta EXPT ) as a function of fragment mass were obtained. Similarly, from the IY values, isotopic width parameter (a A ), the most probable mass (A P ) and the elemental yields (Y Z ) of Sn, Sb, Te, I, Xe, Cs, Ba, La, Ce and Pr were determined by using a non-linear fit. From the Y Z values, the proton even-odd effect ( delta p ) was obtained for the first time . The present data in the 235 U(n, f) reaction were compared with the similar data in the 235 U(n th , f) and 238 U(n, f) reactions as well as of other actinides to examine the role of excitation energy and pairing effect.

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